Oops, that was a little groan from Harley. Hey, he already knew it didn't take a ton to get her going, and she'd already had a head start with all the dirty thoughts she'd been alluding to! Add to that how thin the clothing on her was and how she tended to respond to him in general and, well...

Yeah, a groan. Some more tugging on his hair, too. And her other hand straying over his shoulder to scratch at his back.